続き。

6 How disappointing ( ) he should have failed .

7 Nobody would employ John, ( ) they all know is dishonest.

8 I wonder ( ) has become of him.

9 ( ) was natural in view of his musical past , he was enjoying the music enormously .

10 All this , ( ) it takes me so long to describe , impressed itself upon me in a few seconds.

as , he , that , what , which , who

6はit isが省略されてます。

７のthey all knowは挿入と考えることができます。

１０はdescribeの目的語がないですよね。